Surfacing apparatus



NOV. 26, 1929. H, R, STRATFORD 1,737,099

sURFAcING APPARATUS Filed J111yv29. 1927 m @CPM A TTORNEY.

Patented Nov. 26, 1929` UNITED STATES PATEN olf-FICE HEBT R. STRATFORD,OF CLEVELAND, OHIO, ASSIGNOR '.IICD THE STRTMORE COM= PANY, OFCLEVELAND, OHIO, A CORPORATION OF OHIO SURFACING Application led July29,

rlhe presentinvention, relating as indicated to surfacing apparatus ismore particularly directed to an improved surfacing or abrasive disk andto a means for supporting and re- 5 niovably retaining the disk while inopera- 10 ly securing thereto, or removin tion. rl`he principal objectof the invention is the provision ol a new and improved supporting pad.having a certain compressibility and simple and convenient means forquicktherefrom, a new and improved surfacing isk.

rlo the accomplishment of the foregoing and related ends, saidinvention, then, consists ol the means hereinafter fully described andparticularly pointed out in the claims; the annexed drawing and thefollowing description setting forth in detail certain mechanismembodying the invention, such disclosed means constituting, however, butone of various mechanical forms in which the principle of the inventionmay be used ln said annexed drawings llig. l is a bottom plan view otone form of my improved surfacing disk; Fig. 2 is a section ol the sameon the line 2 2 in 1F10. l llig. 3 is a central transverse sectionthrougli my improved disk and supporting pad showing the engagementbetween the two; llig. l is a view similar vto Fig. 3, buton an enlargedscale and showing the engaging portions of disk and pad; Fig. 5 is abottom plan view oi another term of surfacing disk; and llig. 6 is apartial section on an enlarged. scale showing the engagement between the5 disr el Fig. 5 and complementary supporting p Surfacing machines arenow in quite general use lor the surfacing, i. e., the abrading,polishing, etcf, of metal, wood and other or casing provided withhandles for the use ol an operator and having a suitable source of powereither contained within the casing (as in the form ot an electric or airmotor), 5 or transmitted through the casing by means oic gears containedtherein from a flexible shalt or other driving means. machines includesan extending shaft on which there is ordinarily supported a supportingdisk or pad, to which is removably panels, in which the machinecomprises a head This type of APPARATUS i927. serial No. 209,193.

work. lt is very desirable from the standpoint of successful operationol the disk that it be relatively treerom the su porting pad, althoughnecessarily attached t creto at one or more points adjacent to thecenter, and

it is equally desirable, 'in order to secure convenient and rapidremoval and replacement of worn disks, that the latter be readily detached from the pad and a new disk positioned with equal convenience andquickness. The present invention is particularly directed to an improvedmeans tor securing the surface ing disk to the supporting pad, suchmeans combining both the necessary freedom ot movement between disk andpad, except at the point ot attachment, andthe convenience and speed olattachment and removal.

ln lig. 3, l have shown a typical type of pad consisting otlapped platesd, 5, 6 and l ot resilient material, such as rolled steel, upon theuppermost plate 5 of which is secured 'a compressiole pad or disk Il..To the plate 7 is secured a hub n9 provided with a tlaiige 8, the hubbeing adapted to be removably secured to the extending end ot thedriving shalt ot the machine described above so each other andintegrally united to the lay ers of rubber l0 by Suitable`vulcanization., while the upper layer l2 ot iabric is provided with aninwardly extending tongue portion 13 free trom the adjacent rubber 10and capable of being inserted betweenv a relient collar l5 secured to asurfacing disk 16.' .disk 16 may be termed ot various materials, but isordinarily a composite diskV formed of layers ot a suitable paper stock,to which is The adhesively united a fabric, while to the latter thegrains of abrasive are also adhesively unitedon one surface. To thereverse side of the disk is secured a collar 15 provided with anoutwardly extending flange 17 adapt-Y` ed to be inserted between theextending portion 13 of the fabric 12 and the adjacent layer of rubber10. If necessary radial slits'may be formed in the iange 17 to permit ofits more convenient introduction between the element l3and the pad 10proper. After these eiements have been enga ed as described the pressureof the disk agalnst the work and the unavoided friction between thecontacting surfaces of the elements 15 and 13, 13 and 17, and 17 and 1()will provide a very secure driving engagement between disk and ad, andyet one which may be readily severed y merely pulling the disk away fromthe pad once t ie machine is stopped for the purpose of applying a newdisk.

In Fig. 6 I have shown a pad provided with a plurality of inclinedradially extending slots 20, which may be either separated slots or mayform part of a single encircling slot, into which are adapted to beinserted oppositely directed wings 21 secured to the lower surface ofthe abrasive disk 22. If the slots are separate slots, as shown in Fig.5, there is of course a direct driving engagement between the radial endwall of each slot and the corresponding adjacent edge of the wings 21,while in the event of a continuous slot in the pad the friction betweenthe side walls of the wing and the slot is entirely suiiicient fordriving the disk in unison with the pad.

In either of the forms described above the disk may be readily insertedand instantly removed from the pad while the engagement in two forms ofthe device is through relatively extensive frictio'nal surfaces pressedinto engagement by the pressure of the disk against the Workl andtherefore graded according to the resistance to the driving, or it .is adirect driving engagement between wings on one element and cooperativeslots or driving faces on the other. The entire device is simple, in eXensive and extremely convenient and rapld in operation.

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as regards the mechanismherein disclosed, provided the means stated by any of the followingclaims or the equivalent of such stated means be em-Y ployed.

I therefore particularly point out and distinctly claim asmyinventicn 1. In apparatus of the character described,

- the combination of a yieldable supportingpad provided with aprojecting driving wing, andV a surfacing disc provided with a drivingsurface positioned to be engaged by said wing whereby friction betweensaid wing and driving surface due to the pressure of the disk toward thepad serves to rigidly secure the same together. l

2. In apparatus of the character described, the combination of ayieldable supporting pad provided with a projecting driving wing on onesurface, and a surfacing disc' having a complementary drivin surfacepositioned to be operatively engage by said wing on said pad wherebyfriction between said wing and driving surface due to the pressure ofthe disk toward the pad serves to rigidly secure the same together.

3. In apparatus of the character described, the combination of ayieldable supporting pad provided with an annular frustrolconicaldriving wing on one surface, and a surfacing disc have a.complementarypocket adapted to receive said wing in drivin engagement,said disk when pressed towar said pad being adapted to rigidly lock theengaging surface of said wing within said pocket.

Signed-b me, this 27th day of July, 1927.

' H RBERT R, STRATFORD.

